One-to-one Definition
wŭntə-wŭn
adjective
Permitting the pairing of an element of one group with a corresponding element of another group.
Webster's New World
Designating a correspondence such that each member of a set has just one partner in another set, and no element in either is without a partner.
Webster's New World
The definition of one-to-one refers to a situation where every item has a pair.
When there is one teacher for every student, this is an example of a one-to-one ratio.
YourDictionary
(chiefly UK) Involving direct communication between two people. Used especially to refer to situations in which one person is teaching one other person.
Wiktionary
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noun
A personal relationship between two people.
Wiktionary
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